JPS5831087Y2 - Magnetization device in magnetic flaw detector - Google Patents
Magnetization device in magnetic flaw detectorInfo
- Publication number
- JPS5831087Y2 JPS5831087Y2 JP1979065913U JP6591379U JPS5831087Y2 JP S5831087 Y2 JPS5831087 Y2 JP S5831087Y2 JP 1979065913 U JP1979065913 U JP 1979065913U JP 6591379 U JP6591379 U JP 6591379U JP S5831087 Y2 JPS5831087 Y2 JP S5831087Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- current
- rod
- magnetic flux
- shaped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
【考案の詳細な説明】
本考案は、磁気探傷器における磁化装置、特に中空円筒
状の被探傷物に対する磁化装置に関する。[Detailed Description of the Invention] The present invention relates to a magnetization device for a magnetic flaw detector, and particularly to a magnetization device for a hollow cylindrical flaw detection object.
磁気探傷器は、被探傷物に磁界を加えて磁束を通させ、
磁粉をかげた場合に傷があると生じる漏洩磁束により磁
粉が傷の部分に集中して付着することを利用して探傷す
るものである。A magnetic flaw detector applies a magnetic field to the object to be tested, causing magnetic flux to pass through.
Flaw detection is performed by utilizing the fact that magnetic particles concentrate and adhere to the scratched area due to leakage magnetic flux that occurs when there is a scratch when magnetic particles are exposed.
被探傷物が中空円筒状のものである場合、これを磁化す
る装置としては、従来第１図及び第２図に示すようなも
のがある。When the object to be inspected has a hollow cylindrical shape, conventional devices for magnetizing the object are shown in FIGS. 1 and 2.
第１図にお（・て、１は筒状部材３より成る中空円筒状
の被探傷物、２は銅、アルミニウム、真鍮などの導電材
料より成る通電棒、Ｅは電源、■は電流を示す。In Figure 1, 1 is a hollow cylindrical object to be inspected made of a cylindrical member 3, 2 is a current-carrying rod made of a conductive material such as copper, aluminum, or brass, E is a power source, and ■ is a current. .
このような装置においては、被探傷物１の筒状部材３の
内部に磁束ｆが矢印で示す円周（横）方向に発生するの
で、４で示すような縦方向の傷の探知は容易であるが、
横方向の傷は探知が困難である。In such a device, a magnetic flux f is generated inside the cylindrical member 3 of the object to be inspected 1 in the circumferential (horizontal) direction shown by the arrow, so it is easy to detect flaws in the vertical direction as shown by 4. Yes, but
Lateral scratches are difficult to detect.
第２図において、５は珪素鋼板より成る磁心、６はコイ
ルを示す。In FIG. 2, 5 indicates a magnetic core made of a silicon steel plate, and 6 indicates a coil.
このような装置においては、被探傷物１の筒状部材３の
内部に磁束ｆが矢印で示す縦方向に発生するので、７で
示すような横方向の傷の探知に適するが、縦方向の傷の
探知には適しない。In such a device, the magnetic flux f is generated inside the cylindrical member 3 of the object 1 in the vertical direction indicated by the arrow, so it is suitable for detecting flaws in the horizontal direction as shown in 7. Not suitable for detecting scratches.
第１図のやり方を電流貫通磁化法、第２図のやり方を磁
束貫通磁化法と呼んでいる。The method shown in FIG. 1 is called the current penetration magnetization method, and the method shown in FIG. 2 is called the magnetic flux penetration magnetization method.
縦方向の傷も横方向の傷も同時に検出できるようにする
ために、上記の電流貫通磁化法と磁束貫通磁化法を組合
わせようとしても、単に組合わせただけではうまくゆか
ない。Even if an attempt is made to combine the above-mentioned current penetration magnetization method and magnetic flux penetration magnetization method in order to be able to detect both longitudinal and horizontal scratches at the same time, the mere combination will not work.
というのは、第２図の磁心５内に第１図の通電棒２を通
して上記２つの方法を組合わせる場合には、通電棒２の
発生した磁束は、周りの磁心５に吸収されてその外周に
置かれた被探傷物１まで及ばず、また、第２図の磁心５
を第１図の通電棒２と兼用させる場合には、磁気探傷用
の電流は低電圧、大電流（例えば、３Ｖ。This is because when combining the above two methods by passing the current-carrying rod 2 shown in FIG. 1 into the magnetic core 5 shown in FIG. It does not reach the object to be tested 1 placed in the
When used as the current-carrying rod 2 in Fig. 1, the current for magnetic flaw detection is low voltage and high current (for example, 3V).
３０００Ａ）を用いるのが普通であるから、磁心５とし
て従来のような珪−素鋼板をカシメたものを用いると、
電流が並列に並べられた各珪素鋼板に均等に分流しない
などのため均一な磁界が得難＜、したがって、珪素鋼板
を１枚ずつ電極材を用いて加工したり、珪素鋼磁心を丸
棒状に作り上げるなどの必要があるからである。3000A) is normally used, so if a conventional crimped silicon steel plate is used as the magnetic core 5,
It is difficult to obtain a uniform magnetic field because the current is not evenly distributed to each silicon steel plate arranged in parallel. Therefore, it is difficult to obtain a uniform magnetic field by processing the silicon steel plates one by one using electrode material, or by cutting the silicon steel magnetic core into a round bar shape. This is because it is necessary to create something.
そこで、珪素鋼板より成る磁心５の代かりに一般鉄材の
うち比較的透磁率の高い軟鉄材又は純鉄材などを用い、
これを電流貫通用及び磁束貫通用の棒材に兼用すること
にすれば、先ず第３図に示すような磁化装置が考えられ
る。Therefore, instead of the magnetic core 5 made of a silicon steel plate, soft iron material or pure iron material with relatively high magnetic permeability among general iron materials is used.
If this is used as a bar material for both current penetration and magnetic flux penetration, a magnetization device as shown in FIG. 3 can be considered.
図において、２′が上記のような磁性体より成る通電棒
で、ぎはコイル、ｅｌ、ｅ２はそれぞれ交流電源を示す
。In the figure, 2' is a current-carrying rod made of a magnetic material as described above, gi is a coil, and el and e2 are AC power supplies, respectively.
１１゜ｉ２は、それぞれ交流電流であるが、便宜上極性
を付けて成る瞬間における方向を示しｔう被探傷物１の
筒状部材３の内部には、通電棒２を流れる電流１１によ
り磁束ｆ１が矢印で示す横方向に発生すると同時に、コ
イル６′を流れる電流１２により磁束ｆ２が矢印で示す
縦方向に発生する。11゜i2 is an alternating current, and for convenience, polarity is attached to indicate the direction at the moment. Inside the cylindrical member 3 of the object to be tested 1, a magnetic flux f1 is generated by the current 11 flowing through the current-carrying rod 2. At the same time as the magnetic flux f2 is generated in the horizontal direction shown by the arrow, a magnetic flux f2 is generated in the vertical direction shown by the arrow due to the current 12 flowing through the coil 6'.
ここで、交流電源ｅ１．ｅ２に電圧の位相が同期したも
の又は同一の電源を用いると、電流１１と１２には約９
０゜の位相差が生じ、したがって磁束ｆ０とｆ２との間
にも約９０の位相差が生じるので、両磁束の合成磁界は
［Ｅ８ＵＩＥ磁界となる。Here, AC power source e1. If e2 is synchronized in voltage phase or the same power supply is used, currents 11 and 12 will have approximately 9
Since a phase difference of 0° occurs, and therefore a phase difference of about 90° also occurs between the magnetic fluxes f0 and f2, the combined magnetic field of both magnetic fluxes becomes the [E8UIE magnetic field.
ゆえに、このような磁化装置によれば、一応縦方向及び
横方向の傷を同時に検知することができる。Therefore, with such a magnetization device, it is possible to simultaneously detect scratches in the vertical direction and the horizontal direction.
ところが、かような磁化装置では、コイル６′を流れる
電流１２によって発生する磁束ｆ２は、被探傷物１の筒
状部材３の外周面側を通りやすく、筒状部材３の内周面
側は通りにくい傾向がある。However, in such a magnetization device, the magnetic flux f2 generated by the current 12 flowing through the coil 6' easily passes through the outer peripheral surface of the cylindrical member 3 of the object to be tested 1, and the magnetic flux f2 easily passes through the inner peripheral surface of the cylindrical member 3. It tends to be difficult to pass.
これは、コイル６′を流れる電流１２が、例えば６０Ｈ
ｚの交流電流であることに因る。This means that the current 12 flowing through the coil 6' is, for example, 60H.
This is due to the fact that it is an alternating current of z.
このため、被探傷物１の筒状部材３の内周面側にある傷
を探知しに（い欠点がある。For this reason, there is a drawback that it is difficult to detect flaws on the inner circumferential surface side of the cylindrical member 3 of the object 1 to be flaw-detected.
本考案は、第１及び第２図に示す従来法や第３図に示す
改良例のもつ上述の欠点を一掃した磁化装置を提供しよ
うとするものである。The present invention aims to provide a magnetizing device that eliminates the above-mentioned drawbacks of the conventional method shown in FIGS. 1 and 2 and the improved example shown in FIG.
以下、図面により本考案を具体的に説明する。Hereinafter, the present invention will be explained in detail with reference to the drawings.
第４図は、本考案の実施例を示す構成図である。FIG. 4 is a configuration diagram showing an embodiment of the present invention.
図において、１ ＊ ２’＊ ３−ｅ１ｓｅ２ｅ ｉ１
＊ １２は既に説明したものと同じである。In the figure, 1*2'*3-e1se2e i1
*12 is the same as already explained.
５′はコ字状の磁心（例えば鉄心）で、６“はこれに巻
回したコイル、８．８は通電棒２に対する電極、９．９
は電極Ｂ。5' is a U-shaped magnetic core (for example, an iron core), 6'' is a coil wound around this, 8.8 is an electrode for the current-carrying rod 2, and 9.9
is electrode B.
８と磁心５′とを電気的に絶縁するための絶縁物を示す
。An insulator for electrically insulating 8 and the magnetic core 5' is shown.
通電棒ｒを流れる電流１１により被探傷物１の筒状部材
３の内部に矢印で示す横方向に磁束ｆ１が発生すること
は、上述のとおりである。As described above, the current 11 flowing through the current-carrying rod r generates a magnetic flux f1 inside the cylindrical member 3 of the object 1 to be inspected in the lateral direction shown by the arrow.
コイル６″を流れる電流１２により、矢印で示すように
、磁心５′及び磁性体の通電棒２′よりなる磁気回路を
通る磁束ｆ２が発生する。The current 12 flowing through the coil 6'' generates a magnetic flux f2 that passes through a magnetic circuit consisting of a magnetic core 5' and a magnetic current-carrying rod 2', as shown by the arrow.
この交流磁束ｆ２により、被探傷物１の筒状部材３の内
部を矢印で示す円周方向に環流する交流電流ｉ３が発生
し、この渦電流ｉ３によって被探傷物１の筒状部材３の
周囲に矢印で示す縦方向に磁束ｆ３が発生する。This alternating current magnetic flux f2 generates an alternating current i3 that circulates inside the cylindrical member 3 of the object to be tested 1 in the circumferential direction shown by the arrow, and this eddy current i3 causes the eddy current i3 to circulate around the cylindrical member 3 of the object to be tested 1. A magnetic flux f3 is generated in the vertical direction shown by the arrow.
ここに、磁束ｆ１とｆ３との間に第５図に示すように二
（９００）の位相差をもたせることは極めて容易であり
、そうすると、両者の合成磁界は完全な回転磁界となる
。Here, it is extremely easy to provide a phase difference of 2 (900) between the magnetic fluxes f1 and f3 as shown in FIG. 5, and then the combined magnetic field of both becomes a complete rotating magnetic field.
このような本考案にかかる磁化装置においては、磁界を
いわば被探傷物１の外周面側から加えている第３図のも
のとは異なり、磁界を被探傷物１の内周面側から加えて
渦電流を発生させることにより、被探傷物１の内周面側
にも充分な磁束を通すようにしたから、内周面側の傷も
容易に検知することができる。In the magnetization device according to the present invention, unlike the one shown in FIG. 3 in which the magnetic field is applied from the outer peripheral surface of the object 1 to be tested, the magnetic field is applied from the inner peripheral surface of the object 1 to be tested. By generating an eddy current, sufficient magnetic flux is passed through the inner circumferential surface of the object 1 to be inspected, so that flaws on the inner circumferential surface can be easily detected.
そのほか、本考案によれば、均一な磁界を発生して縦横
のみならずあらゆる方向の傷を探知することができるば
かりでなく、１つの棒状導電性磁性体を電流貫通用と磁
束貫通用とに共用したため、構造が簡単で小型化が容易
となる利点がある。In addition, according to the present invention, not only can a uniform magnetic field be generated to detect flaws in all directions, not just vertically and horizontally, but a single rod-shaped conductive magnetic body can be used for current penetration and magnetic flux penetration. Because they are shared, the structure is simple and can be easily miniaturized.
なお、本考案は、上記の実施例に限らず、実用新案登録
請求の範囲に記載した本考案の要旨を逸脱しない範囲内
において、種々の変形、変更が可能であることはいうま
でもない。It goes without saying that the present invention is not limited to the above-described embodiments, and that various modifications and changes can be made without departing from the gist of the present invention as stated in the claims of the utility model registration.
第１図及び第２図は従来法を示す構成図、第３図は従来
法の改良例を示す構成図、第４図は本考案の実施例を示
す構成図、第５図はその動作を説明するための磁束波形
図である。
１・・・・・・被探傷物、２′・・・・・・棒状導電性
磁性体、５′・・・・・・磁心、６″・・・・・・コイ
ル、８．８・・・・・・電極、ｅｌ。
ｅ２・・・・・・交流電源、１１．１２・・・・・・交
流電流。Fig. 1 and Fig. 2 are block diagrams showing the conventional method, Fig. 3 is a block diagram showing an improved example of the conventional method, Fig. 4 is a block diagram showing an embodiment of the present invention, and Fig. 5 shows its operation. It is a magnetic flux waveform diagram for explanation. 1...Object to be inspected, 2'...Bar-shaped conductive magnetic material, 5'...Magnetic core, 6''...Coil, 8.8... ... Electrode, el. e2 ... AC power supply, 11.12 ... AC current.
Claims (1)
性体と、この棒状磁性体に交流電流を流通せしめる手段
と、交流電流によって発生する交流磁束を磁心を介して
上記棒状磁性体に貫通せしめる手段とを具え、上記棒状
磁性体を流通する交流電流によって発生する交流磁束と
上記棒状磁性体を貫通する交流磁束との間に位相差をも
たせることにより、両交流磁束の合成磁界を回転磁界と
したことを特徴とする磁気探傷器における磁化装置。A rod-shaped conductive magnetic body that penetrates the hollow part of a hollow cylindrical object to be inspected, a means for passing an alternating current through the rod-shaped magnetic body, and an alternating current magnetic flux generated by the alternating current passed through the magnetic core to the rod-shaped magnetic body. and a means for penetrating the rod-shaped magnetic body to create a phase difference between the AC magnetic flux generated by the AC current flowing through the rod-shaped magnetic body and the AC magnetic flux passing through the rod-shaped magnetic body, thereby rotating a composite magnetic field of both AC magnetic fluxes. A magnetization device in a magnetic flaw detector characterized by a magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979065913U JPS5831087Y2 (en) | 1979-05-17 | 1979-05-17 | Magnetization device in magnetic flaw detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979065913U JPS5831087Y2 (en) | 1979-05-17 | 1979-05-17 | Magnetization device in magnetic flaw detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55165266U JPS55165266U (en) | 1980-11-27 |
| JPS5831087Y2 true JPS5831087Y2 (en) | 1983-07-09 |
Family
ID=29299896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979065913U Expired JPS5831087Y2 (en) | 1979-05-17 | 1979-05-17 | Magnetization device in magnetic flaw detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5831087Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5729824B2 (en) * | 2011-09-26 | 2015-06-03 | 新日鐵住金株式会社 | Magnetizer for magnetic particle inspection of wheels |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50115888A (en) * | 1974-02-25 | 1975-09-10 |
-
1979
- 1979-05-17 JP JP1979065913U patent/JPS5831087Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50115888A (en) * | 1974-02-25 | 1975-09-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55165266U (en) | 1980-11-27 |
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